Biographical profile of the theoretical astrophysicist and aeronomist Alexander Dalgarno, centering on his professional life at the Center for Astrophysics. Early life and training in London. Schooling and entrance to University College, London. Recollections of wartime life in London and Aberdeen. College years and experiences as a student. Development of interest in mathematics. Friends, colleagues and teachers at college. Graduation in 1948 and contact with Harrie Massey which led him into physics.

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